216706255 has 8 divisors (see below), whose sum is σ = 261060912. Its totient is φ = 172689408.

The previous prime is 216706247. The next prime is 216706289. The reversal of 216706255 is 552607612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216706255 - 2³ = 216706247 is a prime.

It is a super-2 number, since 2×216706255² = 93923201912250050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216706255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83037 + ... + 85606.

It is an arithmetic number, because the mean of its divisors is an integer number (32632614).

Almost surely, 2^216706255 is an apocalyptic number.

216706255 is a deficient number, since it is larger than the sum of its proper divisors (44354657).

216706255 is a wasteful number, since it uses less digits than its factorization.

216706255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168905.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 216706255 is about 14720.9461312784. The cubic root of 216706255 is about 600.6532283779.

The spelling of 216706255 in words is "two hundred sixteen million, seven hundred six thousand, two hundred fifty-five".